Help - Cardinals losing fins overnight

jjencek

New member
I have been breeding cardinals and my latest 20-day old batch of 45 of them has been doing well until today. There is about 30% of them that lost some or all of their fins over the last 24 hours.

Is seems to start with one of their tail fins and then it fast progresses.

I have never seen this and have no idea what is going on.

Anybody has suggestion?
 
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